Plugs for the EVO

[-EpicEVO-]

Well most of you are familier with my setup. but i'm running the NGK iritium sp? plugs however i don't know if these are the best plugs to run with on nitrous.. any thoughts??

MARK

[cotsi95]

ive never had a problem with them...

[cotsi95]

btw are you running any stages colder?

[v413nc3]

Iridium plugs are awesome, just costly. You can foul them and just do some highway cruising and they'll clean right up. For the price though I can buy a lot of NGK coppers :)

[sbiggi]

I trap as much as you do and was running bpr7es with nitrous.

They were a touch to hot of a plug, so now I'm on bpr8es.

I wont spend the money on Iridium plugs. You can get like 8 sets of normal plugs for as much as they cost.

[hisandherturbo]

I've never ran anything other then the PBR7ES' myself, but then again, NO NOS, and NO Race gas.........I am sure the COP's and MSD Ignition put them to the test though.

[biglady112]

BR8ES on pump gas with the juice. BR9ES On race gas. Regular copper works great.

Steven

[v413nc3]

You are all throwing out these numbers without much consideration for what they mean. To blanket state that you need one heat range for pump gas and a different for race gas is rather blind.

Our cars (DSMs not Evos) come with BPR6ES NGK plugs. Resistant, Projected Tip with a 6 heat range (hot). This means that the insulator does not pull heat out of the plug as fast as say, a 7 or 8 range plug. What this SPECIFICALLY means is that a 6 range plug will not foul as quickly as a colder plug (7/8), but will heat up and may lead to slight knock propensity or misfire issues. Conversely running a colder plug will lower the knock propensity and misfire under higher cylinder pressure and temperatures by keeping the plug colder, but will foul faster. Remember that electricity is heat variant. The hotter a conductor is the less power it will transfer. So the hotter your plug is the harder it is for it to spark, especially under heavy boost. What this does NOT mean is that you should get the coldest plug and just throw them in there. The colder you go the more often you will have to change the plugs. Only go as cold as needed to keep your ignition firing clean or you will find misfires related to fouled plugs.

And FYI I only run BR7ES plugs. It's all dependant on the setup.

[biglady112]

Ok. 9's with really really big boost and nitrous.

Steven

[DlandryTSI]

For what you are doing Mark. You could get away with 7's. If the knock count is pretty high you can try some 8's. But that is as cold as you want to go with the basic setup you have.

On my old setup I ran 30psi plus a 50 shot single fogger on 7es's just fine.

--Dave

[sbiggi]

With mine the 7's were hot enough to burn the carbon off, so I went with a colder plug.

To determine what you need, all you have to do is look at the current spark plugs.

[-EpicEVO-]

Awesome well thanks everyone!! I unfortunitly just pissed away 55 bucks on iritiums i could have just gone with the 7's. I figured that would happen. The iritiums are better than 7's though right, they are just way expensive is that why most people don't use them or are 7's better??

Did that makes sense to anyone?
MARK

[v413nc3]

What specific Iridium did you get? They too have heat ranges. The range relates to the insulator and tip design.